水平内螺纹管中超临界RP-3航空煤油换热数值研究  

Numerical study on heat transfer of supercritical RP-3 aviation kerosene in horizontal internally ribbed tubes

作　　者：王彦红 孙文清 贾玉婷[1] 东明[2] 李洪伟[1] WANG Yanhong;SUN Wenqing;JIA Yuting;DONG Ming;LI Hongwei(School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China;School of Energy and Power Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012 [2]大连理工大学能源与动力学院,辽宁大连116024

出　　处：《推进技术》2024年第6期190-199,共10页Journal of Propulsion Technology

基　　金：国家自然科学基金(52106196);吉林省教育厅科技项目(JJKH20220100KJ)。

摘　　要：针对航空换热器的应用,对水平内螺纹管中RP-3航空煤油的超临界换热进行了数值研究,着重考察煤油压力和螺纹升角对换热的影响。基于管截面温度、密度、局部质量流速、流线分布状况,揭示周向非均匀传热恶化的机理。通过类气膜温度梯度和旋流动能的演变以定量表征类气膜程度和旋流强度。提出了适用于周向四个位置努塞尔数预测的换热关联式。结果表明:流动性差的类气膜在冷流体和热壁面之间形成阻隔,导致传热恶化问题。浮升力作用致使流场和温度场出现畸变,类气膜厚度周向不均,产生局部超厚类气膜,对应的传热恶化加剧。厚类气膜区和二次流涡在浮升力和螺纹旋流耦合机制下沿流动方向不断逆时针改变位置。提高煤油压力有利于削弱和延后类气膜效应,且使旋流强度下降。随着螺纹升角增大,类气膜效应略有削弱和后延,旋流强度显著提高。换热关联式预测偏差普遍位于±10%的误差范围。Numerical research on supercritical heat transfer of RP-3 aviation kerosene in horizontal internally ribbed tubes was conducted for the application of aviation heat exchanger.Effects of the kerosene pressure and rib rise-angle on heat transfer were investigated in detail.The circumferential non-uniform mechanism of heat transfer deterioration was analyzed based on the temperature,density,local mass flux and streamline distributions in tube cross-sections.The gas-like film degree and swirl intensity were quantitatively characterized through the evolution of gas-like film temperature gradient and swirl kinetic energy.The heat transfer correlations suitable for predicting the Nusselt number at four circumferential positions have been proposed.The results indicate that the gas-like film with poor fluidity forms isolation between the hot wall surface and the cold fluid,leading to the deteriorated heat transfer.The buoyancy effect causes the distortions in flow field and temperature field,resulting in the circumferential unevenness thickness of gas-like film and the local ultra thick gas-like film,which exacerbates the corresponding heat transfer deterioration.The thick gas-like film region and the secondary flow vortices continuously change their positions counterclockwise along the flow direction under the coupling mechanism of buoyancy and swirl flow.Increasing the kerosene pressure is beneficial for weakening and delaying the gas-like film effect,and reducing the swirl intensity.With the increase of rise angle of rib,the gaslike film effect is slightly weakened and delayed,while the swirl intensity is significantly increased.The prediction deviation of heat transfer correlation is generally within the error range of±10%.

关 键 词：空-油换热器 内螺纹管 超临界 换热 浮升力 类气膜温度梯度 旋流强度 

分 类 号：V231.1[航空宇航科学与技术—航空宇航推进理论与工程]